Rivet set



Jan. 16, '1923. 1,442,223.

G. H. KNEBUSCH.

mvET SET. FILED DECZZZ, 1919.

Patented Jan. 16, 1923.

*UNITED* STATES PATENT OFFICE. f

GEORGE H4 KNEBUSCH, OF CLEVELAND, OHIO, ASSIGNOR TO` CLEVELAND ,STEEL ATOOL COMPANY, OF CLEVELAND, OHIO, A CORPOYRAIION` 0F OHIO.

' RIVET SET.

, Application filed December 22, Y1919.- Serial No. 346,448.

To all whom if may concern;

Be it known that I, GEORGE H. KNnUsoH, a. citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new. and useful Improvements in Rivet Sets, of which the following is a specification.

`This invention relates to rivet sets.

The object of the invention is to provide an improved rivet setV so constructed vas to reduce the liability of the head snapping off from the shank; which is of simple construction and can be easily assembled, and to improve-the construction so that thek rivet setl is to all intents and purposes Aa rigid' solid member although constructed of several pieces.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter. d

The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the drawings, Fig. 1 represents a longitudinal sectional elevation of 'one forni of rivet set embodying the invention; and Fig. 2 is a plan view of a securing ring.

The ordinary rivet set comprises a shank adapted for insertion into or connection to the riveting hammer or tool, said shank being provided with a head suitably formed to shape the rivet head. These sets are usually formed of expensive tool steel, in the temper-v ingof which slight cracks may be developed or interna-l stresses or strains may be set up so that for these or other reasons use of the set frequently causes the head -to snap olf from the' shank. Frequently this breakage is due to the fact that blows are imparted to the rivet at an angle so that `the force is not in line with the axis of theset, and the angular strain breaks the shank transversely where it joins the head.

I have found from experience that the liability of the head snapping olf. from the shank may be greatly reduced by making the two parts separate and providing proper means for connecting them together so as to act as a practically rigid or integral member. This arrangement also enables the head to be made of more expensive tool steel and the shank of less expensive material'if de-v sired.

Referring now to the drawings the rivet set illustrated comprises a substantially cyrpractically no play therein'.

lindrical shank '1 which isprovided nearione en d with an annular lgroove or channel 2 which is rectangular in cross section ina transverse plane through the a-Xis of the shaft, as shown in Fig. 1, to provide square shoulders 3, 4. Either'or both ofthe ends lof the shaft mayy be beveled' off, as indicated at 5, for conveniencejof manufacture, aln though this is not essential.

l.To the shank is secured a head i-provided with the customary forming cavity 7, the

opposite end of said head beingprovided with a xcylindrical opening S to receivethe shank, which fits said opening closely with K In the cylindrical opening of thehead at a point arpproXim'ately midway of the 'depth thereof,

as, Shown 'in the drawings', is an annular groove or channel 9 of'form similar to the channel 2, so as to provide square'shoulders or abutments 10, 11, which align or are in registration `with the similar square shoulders 3, 4; of the channel in the shank. When the head and shank are assembled the channels 2 and 9 lie directly opposite each other as shown in Fig. 1.

l12 indicates a securing ring, which is' f rectangular iny cross section and 4is provided with a fairly wide gap 13. made of resilient metal witha normal tendchannel 9V in the head of' the rivety set.

This ring is In assembling the parts the ring 12 is inserted into the groove 3 yof the shank, which is deep enough to receive said ring when compressed without any portion of said ring extending beyond the external surface of.

the shank. 4The shank isthen inserted intc the cylindrical opening of the-head and .as soon as the parts are pushed home ring 12 -parts'the ringv lies partly in channel 2 and partly in channel 9 and engages the square shoulders 3,4 and 10, 11 of both parts.

In the assembled relation the shaiikclosely .expands outwardly into vthe channel 9 of fits the head so'that there is-no lateral play,

and as the end of the shank abutsthe bottom of the cylindrical Aopeningof the head` said abutment and the ring 12 p revent longitudinal play. The parts therefore' act as though integral. They arey also permanently lconnected because it is impossible in this arrangement to compress the spring ring and detach the parts. The close fit oit the spring ring in its seat and the interengagement or' its transversely extending abutment surfaces with. the aligned abutments of the shank and head enables shock to be transmitted through the ring from head to shank and vice versa, both during impact of the tool With the Work and in the opposite direction on rebound.

This arrangement is found to reduce the liability of the head snapping off from the shank. Indeed, experience shows that the life of the rivet set is very materially increased. lThis may possibly be due to the fact that the strain of angular or glancing blows is not concentrated at the junction ot the head and shank butis distributed over Vsome length of shank.

pand and lying in the annular grooves of said head and shank, said ring vvhen assembled in the rivet set having transversely extending abutment suraces engaging the aligned abutments. of said head and shank and transmitting shock both during impact and rebound.

2. A rivet set, comprising a head provided with a cylindrical opening, a shank having a cylindrical portion entering said opening and at its end abutting the bottom of said opening, said shank and the Wall of said opening having annular grooves provided with abrupt shoulders forming transversely extending abutnients, and a resilient metal ring having a normal tendency to expand and lying in the annular grooves of said head and shank, said ring When assembled in the rivet set having transversely extending abutment surfaces engaging the aligned abutments of said head and shank and transmitting shock both' during impact and rebound, said annular grooves in the shank and Wall ot' said opening being located approximatelyy midway of the depth of said opening and near the end of said shank.

in testimony whereof I .ai-HX my signature.

GEORGE H. KNEBUSOH. 

